.course-nav {
    padding: 10px 80px 0 30px;
    li {
        float: left;
        color: #333;
        margin-top: 5px;
        margin-right: 23px;
        height: 25px;
        cursor: pointer;
    }
    .selected {
        color: #3FA9F5;
        border-bottom: 2px solid #3FA9F5;
    }
}